ok!, Então vamos debuggar sua codificação:
Validation-rules.xml, vamos tem além da sua validação essas padrões do Struts
<form-validation>
<global>
<validator name="required"
classname="org.apache.struts.validator.FieldChecks"
method="validateRequired"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
msg="errors.required"/>
<validator name="requiredif"
classname="org.apache.struts.validator.FieldChecks"
method="validateRequiredIf"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
msg="errors.required"/>
<validator name="validwhen"
msg="errors.required"
classname="org.apache.struts.validator.validwhen.ValidWhen"
method="validateValidWhen"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"/>
<validator name="minlength"
classname="org.apache.struts.validator.FieldChecks"
method="validateMinLength"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.minlength"
jsFunction="org.apache.commons.validator.javascript.validateMinLength"/>
<validator name="maxlength"
classname="org.apache.struts.validator.FieldChecks"
method="validateMaxLength"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.maxlength"
jsFunction="org.apache.commons.validator.javascript.validateMaxLength"/>
<validator name="mask"
classname="org.apache.struts.validator.FieldChecks"
method="validateMask"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.invalid"/>
<validator name="byte"
classname="org.apache.struts.validator.FieldChecks"
method="validateByte"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.byte"
jsFunctionName="ByteValidations"/>
<validator name="short"
classname="org.apache.struts.validator.FieldChecks"
method="validateShort"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.short"
jsFunctionName="ShortValidations"/>
<validator name="integer"
classname="org.apache.struts.validator.FieldChecks"
method="validateInteger"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.integer"
jsFunctionName="IntegerValidations"/>
<validator name="long"
classname="org.apache.struts.validator.FieldChecks"
method="validateLong"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.long"/>
<validator name="float"
classname="org.apache.struts.validator.FieldChecks"
method="validateFloat"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.float"
jsFunctionName="FloatValidations"/>
<validator name="double"
classname="org.apache.struts.validator.FieldChecks"
method="validateDouble"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.double"/>
<validator name="date"
classname="org.apache.struts.validator.FieldChecks"
method="validateDate"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.date"
jsFunctionName="DateValidations"/>
<validator name="intRange"
classname="org.apache.struts.validator.FieldChecks"
method="validateIntRange"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends="integer"
msg="errors.range"/>
<validator name="floatRange"
classname="org.apache.struts.validator.FieldChecks"
method="validateFloatRange"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends="float"
msg="errors.range"/>
<validator name="doubleRange"
classname="org.apache.struts.validator.FieldChecks"
method="validateDoubleRange"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends="double"
msg="errors.range"/>
<validator name="creditCard"
classname="org.apache.struts.validator.FieldChecks"
method="validateCreditCard"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.creditcard"/>
<validator name="email"
classname="org.apache.struts.validator.FieldChecks"
method="validateEmail"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.email"/>
<validator name="url"
classname="org.apache.struts.validator.FieldChecks"
method="validateUrl"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
org.apache.commons.validator.Validator,
javax.servlet.http.HttpServletRequest"
depends=""
msg="errors.url"/>
<!--
This simply allows struts to include the validateUtilities into a page, it should
not be used as a validation rule.
-->
<validator name="includeJavaScriptUtilities"
classname=""
method=""
methodParams=""
depends=""
msg=""
jsFunction="org.apache.commons.validator.javascript.validateUtilities"/>
</global>
</form-validation>
Validation.xml
<form-validation>
<formset>
<form name="bloqueioForm">
<field property="motivo" depends="required">
<msg name="required" key="global.motivoReq"/>
</field>
</form>
</formset>
</form-validation>
Observe que seu form aparece especificado aqui e sua property, até está tranquilo para você, acho!?
Acompanhe na sua JSP:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib uri="/tags/struts-tiles" prefix="tiles"%>
<%@ taglib uri="/tags/struts-html" prefix="html"%>
<%@ taglib uri="/tags/struts-bean" prefix="bean"%>
<%@ taglib uri="/tags/struts-logic" prefix="logic"%>
<html:form styleId="bloqueioForm" action="bloqueia" onsubmit="return false;">
<h2>Motivo*</h2>
<html:text name="bloqueioForm" property="motivo" styleId="txtMotivo"/>
<input type="button" value="Gravar" onclick="salva()">
</html:form>
<html:javascript formName="bloqueioForm"/>
<script type="text/javascript">
function salva(){
if(validateBloqueioForm(document.getElementById('bloqueioForm'))){
document.getElementById('bloqueioForm').submit();
}
</script>
Fiz um exemplo rápido, mas acho que funciona.
Mas mostra bem a parte de validação. Verifica ae certinho o que você fez.
Espero ter ajudado
Flwsss